Q.

When is a complex exponential signal sinusoidal?

A. σ =0 and Ω = 0
B. σ < 0 and Ω = 0
C. σ = 0 and Ω ≠ 0
D. σ ≠ 0 and Ω ≠ 0
Answer» C. σ = 0 and Ω ≠ 0
Explanation: a signal is sinusoidal when σ = 0 and Ω ≠ 0
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